Patent GB-513979-A (GB)
Title: Improvements in or relating to method and machine for forming hollow tubular bodies such as containers from paper or like material
IPC: B31C1/00
Filed: 1938-08-19
Abstract: 513,979. Making paper tubes ; labelling. GARDNER-RICHARDSON CO. Aug. 19, 1938, No. 24442. Convention date, Sept. 23, 1937. [Class 99 (ii)] [Also in Groups III, VIII, XV and XVI] A plurality of tubular hollow bodies such as containers are wound simultaneously by a machine comprising a mandrel assembly having a plurality of mandrels all of which are adapted to be indexed simultaneously as a unit to various successive operative stations, and mechanism for rotating the individual mandrels in a predetermined manner whereby at one of the stations, each mandrel is rotated to wind a plurality of the containers and at another station the mandrels are held stationary to permit the hollow tubular bodies to be discharged therefrom in a predetermined angular position. The machine comprises a pair of side frames 11 supporting at one end a large roll 27 of paper, at the other end the mandrel assembly, and intermediately a main shaft 22 from which all the mechanisms are operated. Feeding webs.-A chain 24 connects a sprocket 23 on the main shaft 22 with a sprocket 25 on a shaft 26 which carries a crank arm adapted to rock a toothed segment 36 connected through a pawl and ratchet device to the lower roll 31 of a pair of feed rolls 30, 31 which periodically draw from the roll 27 a length sufficient for winding the container body. The upper feed roll 30 is carried by pivoted arms and urged against the lower roll by a spring pressing an arm, secured to the pivoted arm, against an adjustable stop. Between the feeding movements, a camoperated brake holds the paper roll stationary and an arm 69 engages in a notch in a disc 66 rigid with the feed roll 31 to lock the feed rolls, the arm having a yielding connection with a cam on the shaft 26. Web-cutting mechanism.-The feed rolls 30, 31 dispose the web beneath a vertically moving knife 76, Fig. 9, operated by links 79 pivoted to arms 80, Fig. 4, on a rock shaft 81, one arm being rigid with an arm 86 on the shaft while the other has a yielding connection with a second arm 86. A slotted cam 84 on the shaft 26 actuates the shaft 81 through an arm 82. The cutting edge of the knife is lower at its ends than in the middle and the knife co-operates with a stationary lower blade 78 which is curved slightly in the direction of the paper travel and pressed by springs 94 against the moving knife. As the upper knife descends, it bends the severed end of the web over the edge of a table 98 between the knife and a pair of nip rolls 110 which draw the web through the cutting device, the bend improving the adhesion of the trailing edge in the wound container. Bars 106 above the table 98 and a resilient presser bar 102 carried by the knife 76 keep the paper stationary during the cutting operation. To cut the web longitudinally into strips or blanks having a width equal to the height of the container body, rotary cutters 146 are fixed to a shaft 130 continuously rotated by a shaft 19 between the driving motor for the machine and the main shaft 22. The shaft 130 carries collars 145, Fig. 15, each having a shoulder 165 against which the cutters 146, in strip form with a serrated cutting edge, are clamped by rings 167 screwed on to the collars. The peripheral speed of the cutters is about one-and-a-half times the speed of the web and they co-operate with circular dies 155 having radial slits 156 selectively disposed beneath the cutters. Brushes 175, rotated by nip rolls 111 similar to the rolls 110, clean the punches and a scraper 190 prevents the brush from being clogged, refuse being removed by a transverse endless conveyer 184. Similar conveyers remove waste strips from the sides of the web. Fixed and swinging guides 198, 198a now direct the blanks to the mandrel assembly. Mandrel assembly.-The blanks are wound upon mandrels 199 several of which are mounted concentrically about a shaft 200 which is rotated to bring them successively to winding, sealing, labelling and discharge positions. A bearing 201, Fig. 22, in the main frame supports one end of the shaft 200 while the other end is mounted in a spider 202 rotatable in a ring member 204, Fig. 39. Adjacent the bearing 201, the shaft carries a pinion 207 in which are ball bearings for the reduced ends 210 of the mandrels proper 211, the reduced portions passing with some clearance through a spider 212. The surface of each mandrel at its other end is flush with the outer surface of the outer member 218 of a ball bearing and this member rolls along the inner edge 205 of the ring 204 which is cut away at its lower part 223 to facilitate discharge of the completed bodies. The pinion 207 is intermittently rotated by a gear 236, Fig. 38, having on its fact studs 235 engaged by a barrel cam 233 on a shaft 232 driven through bevel gearing by the shaft 22. The mandrels are rotated at the winding, sealing and labelling stations by lugs 241, Fig. 32, on crank arms 240 at the ends of the mandrels, the lugs engaging intermittently rotating heads at these stations and travelling along a fixed cam track 260 between them. Approaching the winding position the lug trails behind the mandrel : at that position it enters an aligned cam groove in the winding head 243, Fig. 14, which is driven from the shaft 22 by a mutilated gear 262. and is rotated four times thereby. As the mandrel is moved to the sealing or ironing position, the trailing lug enters one of two diametrically opposed notches 256, Fig. 32, in a rotary sealing head 245 which gives the mandrel two-and-a-half turns disposing the lug in advance of it for transfer to the labelling position where arcuate tracks 259 in the labelling head 247 co-operate with the lug to ensure proper positioning of the label with respect to the seam in the wound body. A mutilated gear 272 drives the labelling head which is itself geared to and rotates the sealing head at the same speed but in the opposite direction. To facilitate stripping, the mandrels are made collapsable, having therein longitudinal slots 320, Fig. 23, which accommodate bars 321 displaceable radially by cooperating inclines on the under surface of the bars and the upper surface of bars 325, Fig. 24, movable by a rod 290 within the mandrel. At the winding station the bars 321. are raised flush with the mandrel surface. Winding mechanism.-Each mandrel accommodates eleven blanks simultaneously. As the blanks approach the mandrel in the winding station, spring fingers 288 on pins 286 in the mandrel 211 are raised and turned to face the blanks by spring fingers 292 on the rod 290 which is movable axially within the mandrel by a cam 300, Fig. 14, on face of the mutilated gear 272. At the commencement of the mandrel rotation, a second series of spring fingers 299 lower the gripping fingers 286 to seize and hold the blanks. The rod 290 has secured to it near its inner end a sleeve 312, Fig. 22, which has limited sliding movement over the reduced part 210 of the mandrel and a roller 313 on the sleeve contacts with the first part of a fixed arcuate cam 315 to return the rod 290 to an intermediate position with both sets of spring fingers 292, 299 clear of the pins 286 as the wound blank or tube approaches the sealing position. This action also retracts partially the bars 321 of the mandrel. Adhesive applying mechanism.-A waterjacketed tank 345, Fig. 4, which may be electrically heated, supplies adhesive to a pick-up roll 346 driven, through reduction gearing, by a sprocket on the chain driving the shaft 130 of the cutting punches, the sprocket also rotating a transfer roll 347 at a much faster speed. The roll 347 is adjustably carried by a bracket mounted on an eccentric on the bearing of the pick-up roll 346 and is moved into engagement with that roll when the winding operation starts by springs controlled by a cam 354 on the shaft 22. The coated, wound blanks are moved to the sealing station where they are rotated beneath a spring-pressed ironing plate 370. Feeding sheets; labelling.-Labels stacked in bins 380 rest upon and overhang both ends of sloping bars 386, Fig. 36. Flexible blades 434 are reciprocated beneath the lower end of the stack by arms 437 actuated by a cam on a shaft 402 connected by a chain drive with the shaft 22 and enter the stack to relieve the lowermost labels of the weight of the bulk of the stack. Each label encircles a tube with a small overlap to which adhesive is applied from a cylindrical container 460 the upper edge 461 of which acts as a scraper for a supply pad 452. A cam on the shaft 402 oscillates the pad 452 to engage it with a pad 443 on a member 442 rocked by cam-actuated segments 445, 446 to apply to adhesive to the lower ends of the lowermost labels. Upper flexible blades 407 now enter the upper side of the stack to separate the lowermost blanks therefrom. The blades 407 are mounted on a frame 412 given a reciprocating motion, by a cam-operated lever 424 engaging an arcuate guide 427 on the frame, and an oscillating movement by a rocking arm 414 linked to the end of the frame, the combined movement bending the upper ends of the lowermost labels on to the adhesively-coated tubes on the mandrel at the labelling station. Simultaneously, a plate 393 normally supporting the upper ends of the labels is withdrawn by a cam on the shaft 402. The rotating tubes draw the bottom labels away from the stacks, the thinness of the bars 386 preventing any material disturbance of the adhesive on the overlaps which are arranged to occur in the centre of the overlap of the tube itself. Stripping mechanism.-The next rotation of the mandrel assembly brings the tubes to the stripping station where the mandrel drops through the gap 223, Fig. 39, in the ring 204 as far as the clearance in the spider 212 permits ; the fall is cushioned and a cam restores the mandrel to its normal position after the stripping has been effected by one of two arcuate plates on an endless conveyer 476. As the tubes slide off the mandrel a jet of compressed air blows